#This is a comment
#There is no ; in python

print(8) #integer value
print("8") #string value, see no difference

'''
This is a multiline comment
try to type these directly in shell to see the differences
8
"8"
'''

print(type(8))
print(type("8"))

'''
try to type these directly in shell to see the differences
type conversion
str(8)
int("8")

6 + int("20")
# integer

"6" + "20"
#string

6 + "20"
#error
why?
'''

x = 20
print(x)    #variable x
print("x")  #string
print('x')  #string

print("----------------")

a, b, c = 20, -45, 30
print('a =', a ,'b =', b ,'c =', c)

print("----------------")

a = 20
b = 30
c = 40
a = 50
print('a =', a)     #why?
print('b =', b)
print('c =', c)

print("----------------")

#delete variable
del a, b
#cannot print a & b anymore

#Python has rules for variable names - etc. google it, it is every where
#floating point numbers, there is a range
x = 18.827498372418273987483274
print(x)   #15 digits only

print("----------------")

x = 38.65
print(x)
x = int(38.65)
print(x)
x = round(38.65)
print(x)
x = round(38.15)
print(x)

print("----------------")
x = 38.1237455
x = round(x, 3)
print(x)
x = 438.1237455
x = round(x, -1)
print(x)

print("----------------")
# \ escape symbol
# \n new line
# \t tab
# \b backspace, only works in command shell
# \a alert, only works in command shell

print('line 1\nline 2\nline 3')
print('Tab 1\tTab 2\tTab 3')
print("Famous quote \"Whatever you are, be a good one. Abraham Lincoln\"")